an exclamation point !
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The Factorial symbol is the exclamation point. (!) This symbol means to multiply a row of natural descending numbers.
The symbol for a factorial is the exclamation point (!). For example, 4! = 4*3*2*1 = 24.
An exclamation mark after a number is the symbol for the factorial function.
Two ways: 1) 2nd -> 0/Catalog -> 3 -> Enter 2) MATH -> ◄ -> 4
It is 4060.